IGCSE Unit 13 - Excretion in Humans

Adjective pertaining to the kidneys

What substance is the urine of a person suffering from diabetes mellitus likely to contain?

• amino acids

• fatty acids

• glucose

• proteins

Which is not a function of the liver?

• Produce glucagon

• Deamination of amino acids

• Break down toxins

• Produce bile

Homeostasis is....

• a change in the base sequence of DNA

• a response in which a plant grows towards or away from a stimulus

• the maintenance of a constant internal environment

• the change in adaptive features of a population over time

Which diet will cause the liver to produce the most urea?

• high carbohydrate, low fat

• high fat, high fibre

• high fat, low protein

• high protein, low carbohydrate

Check the organs which are involved in excretion directly

• Lungs

• Skin

• Heart

• Kidney

• Brain

Which labelled structure contains urine?

• A

• B

• C

• D

What do these results show?

• Less water is lost from the kidneys on a cold day than on a hot day

• More salt is lost from the kidneys on a hot day than on a cold day

• The total amount of salt lost each day is the same

• Water is not lost from the kidneys on hot days

In which order does urea pass through structures in the body?

• A

• B

• C

• D

Which of the following will be present in dialysis fluid?

• urea

• water

• electrolytes (ions)

• red blood cells

• large proteins